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qemu-timer: Skip empty timer lists before locking in qemu_clock_deadline_ns_all

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This decreases qemu_clock_deadline_ns_all's share from 23.2% to 13% in a
profile of icount-enabled aarch64-softmmu.

Signed-off-by: Idan Horowitz <idan.horowitz@gmail.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220114004358.299534-2-idan.horowitz@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Idan Horowitz 2022-01-14 02:43:58 +02:00 committed by Richard Henderson
parent 18b8c47f8e
commit 3f42906c9a
1 changed files with 3 additions and 0 deletions
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3
util/qemu-timer.c
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@ -261,6 +261,9 @@ int64_t qemu_clock_deadline_ns_all(QEMUClockType type, int attr_mask)
}
QLIST_FOREACH(timer_list, &clock->timerlists, list) {
if (!qatomic_read(&timer_list->active_timers)) {
continue;
}
qemu_mutex_lock(&timer_list->active_timers_lock);
ts = timer_list->active_timers;
/* Skip all external timers */